Hand rock-drill.



No. 723,314." ,PATEVNTED MAY 19,j1903.

f. Y. SMITH. HAND ROOK- DRILL.

APPLIOATIQN FILED OUT. 31, 1902.

no MODEL. 7 2 snu -sum z.

v UNITED STATES Patented May 19, 1903.

, PATENT OFFICE.

VALERIUS Y. SMITH, GLOBE, ARIZONA TERRITORY.

HAND 'ROCKQDRILL.

srncrrrcarxon forming part of Letters Patent to. 728,314, dated May 19,1903. Application filed October 31,1902. Serial No. 129,617. (We model.)

T0 at whom. it may concern:

Be it known that I, VALERIUS Y. SMITH, a citizen of the United States,and a resident of Globe, in the county of Gila and Territory of Arizona,have invented certain new and useful Improvements in Hand Rock-Drills;and I do hereby declare that the following is a full, clear, and exactdescription thereof.

My invention has for its object to provide simple economical hand-powerrock-drills similar in general construction and operation to the one setforth in my Patent No. 702,499, of June 17, 1902; and it consists incertain peculiarities of construction and combination of partshereinafter particularly set forth with reference to the accompanyingdrawings and subsequently claimed.

Figure 1 of the drawings represents a sec.- tional view of my improveddrill and is indicated by line 1 1 in Fig. 2; Fig. 2, aside elevation ofthe drill, partly in section, as indicated by line 2 2 in Fig. 4; andFigs. 3, 4, and

5, transverse sectional views, respectively, in

rlicated by lines 3 3, 4 4:, and 5 5 in Fig. 2. Fig. 6 represents anelevation of the clutch side of an arm that constitutes a detail of thedrill mechanism.

Referring by letter to the drawings, A indicates the drill-carriage,attachable to any suitable support, and B the slotted cylindrical casingthat is guided on the carriage. A nut-f lug b of the carriage is engagedby a screw 0, for which the carriage is provided with a bear: ing-arm A,and a hand-crank c is fast on one end of the screw. By manipulationof'the screw the casing B is adjusted on carriage A longitudinally ofthe same.

containing said ratchet-wheel being remov-j able and held in place byscrews, as shown in Fig. 1. V Spring-controlled pawls g are arranged inthe box aforesaid to engage the ratchet-wheel, and one or the other ofthese The drill'shank D is guided in the casing B and provided atpawlsis always active to hold said ratchetwheel against rotation in onedirection. Arranged in casing B, between a partition 72. of same and acollar '5 of shank D, to surround this shank is the power-spring G ofthe drill, and alsosurrounding the shank between its collar and forwardhead of said casing is the buffer-spring H of said drill.

Fulcrumed at its center on a lateral studj of casing B is the doublelever I of the drill, arid links J J connect the ends. of this leverwithslide-bars K K, for which the casing B is provided with guides. Setin an apertured portion of each slide-bar is a pair of gibs is and anintermediate tooth L, that is provided with a lengthwise slot engaged bya 'pin m, set in said bar, the inner end of the tooth being inclined toat times face an incline on the casing above specified. Fast on eachslidebar is one end of a leaf-spring M, and the other or free end ofthis spring impinges againstthe tooth that is carried by said bar, thepower of said spring being against outward movement of said tooth. Eachtooth and the gibs between which its slides are hardened steel, and whenworn new onesmay be substituted. Each of the spring-controlled teethaforesaid is provided at its outer end with;a transverse pin n, on whichantifriction-rollers p are arranged, and arranged in the path of theserollers are partly-inclined prongs q of a fork, the tangrof which isadjustably held in a rear head extension of the casing B by means of aset-screw s, it being understood that said tooth has play between :thefork-prongs.

In one piece with double lover I or otherwise rigid with the same,preferably at an angle thereto, is a plate I,that extends equally inopposite directions from the fulcrum ofsaid lever. The ends of the plateare apertured and provided with teeth radiating from the apertures. Putinto clutch withleither end of the plate is the apertured andradiallytoothed end of an arm N, to which the handlever O of thedrill'is rivetedor otherwise rigidly secured, the clutch union of thearm with said plate at any angle being maintained by means of a bolt andnot, as best shown in Fig. 5, and said arm is made fast to one end orthe other of the aforesaid plate as may suit the convenience of thedrill operator or the circumstances under which the drilling is done.

In practice the lever O is actuated to reciprocate the slide-bars K K,and as each bar moves toward the rear from full forward throw the toothL therewith moving oif the abutting incline of the casing B is forcedinward by the opposing spring M to come against the forward side of thehead (Z of drill-shank D, and thereby move said drillshank rearward,this movement resulting in compression of spring G until such time asthe antifriction rollers 19, with said tooth, ride up on thepartly-inclined fork-prongs in their path. Thetooth is now retractedfrom working contact with head cl of the drillshank, and by expansion ofspring G said shank is shot forward with a rotary motion that resultsfrom the spiral-flange-and-groove engagement of bushing E andratchet-wheel spindle e, arranged as above specified. lVhen one of theslide-bars is moving to the rear, the other has motion in the oppositedirection, and the tooth L therewith is moved outward clear of the headof the drill-shank by riding on the incline of the casing.

The forks above specified are adjusted to regulate the time of'trip ofthe teeth L from working contact with head dof the drill-shank, and thecompression of spring G is consequently more or less, as greater or lesspower is required to drive said shank.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. The combination of the slotted casing, the drill-shank having a rearhead within the slotted portion of said casing, the slide-bars, aspring-controlled sliding tooth carried by each slide-bar and which fora time in the rearward movement of same abuts the drillshank head,whereby said shank is retracted against spring resistancein the casing,means by which the tooth is retracted to clear said head, andlever-and-link mechanism for actuating said slide-bars.

' 2. The combination of the slotted casing, the drill-shank having arear head within the slotted portion of said casing, the slide-bars, aspring-controlled sliding tooth carried by each slide-bar and which fora time in the rearward movement of same abuts the drillshank head,whereby said shank is retracted against spring resistance in the casing,antifriction-rollers carried by the teeth laterally of same, inclinesarranged in the rear paths of the rollers, and lever-and-link mechanismfor actuating said slide-bars.

3. The combination of the slotted casing, the drill-shank having a rearhead within the slotted portion of said casing,'the slide-bars, aspring-controlled sliding tooth carried by each slide-bar and which fora time in the rearward movement of same abuts the drillshank head,whereby said shank is retracted against spring resistance in the casing,antifrictionrollers carried by the teeth laterally of the same,adjustable forks having partlyinclined prongs in the paths of therollers, and lever-and-link mechanism for actuating said slide-bars.

4. The combination of the slotted casing, the apertured slide-bars, apair of gibs and an interposed spring-controlled tooth in the apertureof each bar, a pin crossing said aperture and engaging a slot in thetooth lengthwise of same, the inner end of said tooth being inclined toat times face upon an incline of the casing, the drill-shank having arear head within the slotted portion of said casing in the paths of theslide-bar teeth, means for clearing said teeth from the drill-shan khead when said shank is retracted against spring resistance in thecasing, and lever-and-link mechanism for actuating said slide-bars.

5. The combination of the centrallyfulcrumed lever, a plate rigid withthe lever and extending in opposite directions from the fulcrum of same,said plate being provided with end apertures and teeth radiating fromsaid apertures; an arm having an apertured and radially-toothed end forclutch engagement with either end of the plate, and means by which the,clutch union of the arm with said plate is maintained.

In testimony that I claim the foregoing I have hereunto set my hand, atMilwaukee, in the county of Milwaukee and State of Wisconsin, in thepresence of two witnesses.

VALERIUS Y. SMITH.

Witnesses:

N. E. OLIPHANT, B. C. ROLOFF.

